Novel pile plate type combined retaining structure for widening steep slope fill embankment
By adopting a combined structure of support piles, pile bearing plates, and retaining plates in steep slope embankments, combined with micro-grouting steel pipe piles and prestressed anchor cables, the problems of large earthwork volume and high support cost in widening steep slope embankments were solved, achieving an economical and efficient support effect.
Patent Information
- Application Number
- CN202520132121.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-20
- Publication Date
- 2026-02-03
- Estimated Expiration
- 2035-01-20
AI Technical Summary
When widening the roadbed on steep slopes, existing technologies require large-scale support structures, resulting in large earthwork volume, high support costs, and difficulty in meeting deformation and stability requirements.
A combined structure of support piles, pile bearing plates, and pile retaining plates is adopted. By setting bearing plates, micro-grouting steel pipe piles, and prestressed anchor cables in the upper part of the support piles, the support design is optimized to reduce earthwork and lower costs.
It effectively reduces earthwork filling and lowers support costs, while meeting deformation and stability requirements, thus improving the safety and economy of the support structure.
Smart Images
Figure CN223867221U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of existing embankment widening and renovation projects, and in particular to a novel pile-slab combined retaining structure for widening steep slope embankments. Background Technology
[0002] As important modes of land transportation, highways and railways have experienced rapid development in recent years. Simultaneously, with the increasing volume of freight and passenger transport, existing main transportation lines often cannot meet the growing demand. Therefore, the number of existing line widening and renovation projects is gradually increasing.
[0003] When constructing highways and railways in mountainous areas, the terrain and topography often lead to construction difficulties and higher costs. In particular, when widening and filling roadbeds on steep slopes, the limited land space often necessitates the installation of large-scale retaining structures on the outside of the roadbed to reduce the slope, which multiplies the construction costs and difficulties.
[0004] As a retaining structure, pile-slab walls possess advantages such as high structural rigidity, strong bearing capacity, flexible pile placement, land saving, and strong adaptability. Therefore, they are widely used in roadbed retaining in highway and railway engineering, as well as in slope and foundation pit support in building engineering. They are particularly advantageous when widening roadbeds on steep slopes. However, when the roadbed slope is high and the earthwork volume is large, in order to balance the soil pressure behind the wall, it is often necessary to install retaining piles with larger cross-sections, stronger reinforcement, and longer lengths to meet deformation and stability requirements, resulting in higher support costs.
[0005] To overcome the above problems, this utility model provides a novel pile-slab combined retaining structure for widening steep slope embankments that can reduce earthwork filling, provide more cost-effective support, and meet deformation and stability requirements. Utility Model Content
[0006] This utility model aims to solve the technical problems existing in the prior art. To this end, this utility model provides a novel pile-slab combined retaining structure for widening steep slope embankments, which can reduce earthwork filling, reduce support costs, and meet deformation stability requirements.
[0007] The technical solution adopted by this utility model to solve its technical problem is:
[0008] A novel pile-slab combined retaining structure for widening steep slope embankments is provided, comprising retaining piles, pile bearing plates, and pile retaining plates. The retaining piles are arranged at predetermined intervals at the toe of the existing embankment slope. The pile bearing plates are horizontally positioned on the inner side of the upper middle portion of the retaining piles, with one end fixed to the retaining pile to form a cantilever structure, and the other end extending into the slope surface of the existing embankment slope, creating a cavity between the lower part of the pile bearing plate and the slope surface of the existing embankment slope. The pile retaining plates are located inside the retaining piles and above the pile bearing plates, serving to block the filling soil.
[0009] Preferably, the retaining plate of the pile body is anchored to the support pile through a number of pre-embedded anchor bars.
[0010] Preferably, the cross-sectional shape of the anchoring section of the support pile is square or circular, and the cross-sectional shape of the cantilever section of the pile body is square.
[0011] In some preferred embodiments, the method also includes micro-grouting steel pipe piles, with at least one row of the micro-grouting steel pipe piles anchored to the slope surface of the embankment, and the pile tops being fixed to the end of the pile bearing plate away from the support pile.
[0012] Preferably, the micro-grouting steel pipe pile is drilled using a small geological drilling rig, and the hole is filled with cement grout or cement mortar. The reinforcement material inside the pile has a cross-section of one of the following: circular, U-shaped, or I-shaped.
[0013] In some preferred embodiments, prestressed anchor cables are also included, with a row of prestressed anchor cables arranged along the direction of the pile body.
[0014] Preferably, the free section of the prestressed anchor cable is protected by a stainless steel sleeve within the length of the cavity, while the remaining sections are protected by grouting.
[0015] Compared with the prior art, the beneficial effects of this utility model are:
[0016] 1. This embodiment reduces the amount of earthwork filling by setting a bearing plate in the upper part of the support pile, thereby reducing the backfill pressure on the retaining structure. It also optimizes the design parameters of the support pile and retaining plate (such as cross-sectional dimensions, support pile length, reinforcement amount, etc.), thereby reducing the support cost.
[0017] 2. The design of the micro-grouting steel pipe pile can reduce the bending moment and thickness of the cantilever bearing plate, making it suitable for projects where the roadbed is widened significantly.
[0018] 3. The design of the prestressed anchor cable can better control the displacement of the support pile, shorten the length of the support pile anchorage section, reduce the project cost, and improve the safety of the support structure. It is suitable for projects with high slope support height or weak stratum strength in the support pile anchorage section. Attached Figure Description
[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:
[0020] Figure 1 This is a cross-sectional view of the novel pile-slab combined retaining structure for widening steep slope embankments provided in Embodiment 1;
[0021] Figure 2 This is a cross-sectional view of the novel pile-slab combined retaining structure for widening steep slope embankments provided in Embodiment 2;
[0022] Figure 3 This is a cross-sectional view of the novel pile-slab combined retaining structure for widening steep slope embankments provided in Embodiment 3.
[0023] The attached diagram lists the components represented by each number as follows:
[0024] 1—Support pile, 1.1—Anchorage section, 1.2—Cantilever section, 2—Pile bearing plate, 3—Pile retaining plate, 4—Embedded anchor bar, 5—Miniature grouting steel pipe pile, 6—Prestressed anchor cable, 7—Stainless steel sleeve, 8—Backfill soil, 10—Cavity. Detailed Implementation
[0025] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.
[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.
[0027] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. The terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.
[0028] Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model. Example
[0029] As attached Figure 1 As shown, this embodiment provides a novel pile-slab combined retaining structure for widening steep slope embankments, including retaining piles 1, pile bearing plates 2, and pile retaining plates 3, wherein:
[0030] Several of the aforementioned support piles 1 are installed at a predetermined interval at the toe of the existing embankment slope. Preferably, the support piles are arranged at a spacing of 2.0 to 3.0 times the pile diameter along the embankment direction at the toe of the existing embankment slope, and the support piles are anchored into the deep strata to a certain depth, the specific depth of which is mainly determined by the slope height and the stratum properties of the anchorage section. The support piles are cast-in-place reinforced concrete structures, which are the main load-bearing components, bearing the vertical and horizontal loads generated by the superstructure and the fill. In this embodiment, the cross-sectional shape of the anchorage section 1.1 of the support pile 1 is square or circular, preferably square; when construction conditions permit, mechanical drilling can be used, and when the site is small and large mechanical equipment is not available, manual excavation can be used; the cross-sectional shape of the cantilever section 1.2 of the support pile 1 is square, and it is cast-in-place using formwork.
[0031] The thickness of the pile bearing plate 2 is about 300mm~500mm. It is horizontally set on the inner side of the upper middle part of the support pile 1 (that is, set on the cantilever section of the pile body). One end of it is fixed to the support pile 1 to form a cantilever structure, and the other end extends into the slope surface of the existing embankment slope, so that the bottom of the pile bearing plate and the slope surface of the existing embankment slope form a cavity 10, which mainly bears the self-weight load of the upper filling soil 8.
[0032] The pile retaining plate 3 is a reinforced concrete structure with a thickness of approximately 250mm to 300mm. It is located inside the support pile 1 and above the pile bearing plate 2, primarily serving to retain soil. The pile retaining plate 3 is a cast-in-place structure and is anchored to the support pile 1 via pre-embedded anchor bars 4.
[0033] In this specific implementation, the support piles in this embodiment have a cross-sectional dimension of 1.0×1.5m and a pile spacing of 3.0m. They are arranged along the embankment direction at the toe of the existing fill roadbed slope and anchored into the deep strata to a certain depth. As the main load-bearing components, the support piles primarily bear the vertical and horizontal loads generated by the superstructure and the fill. Generally, the higher the slope and the wider the roadbed, the longer the piles should be, determined primarily through calculation. The pile bearing plate is located approximately 3.0m below the pile top, with a thickness of 0.4m, arranged horizontally, and fixed at one end to the support pile, and is cast simultaneously with the support pile. The pile retaining plate is arranged inside the pile body, with a width of 2.6m, and is connected to the support pile through pre-embedded anchor bars, primarily serving a retaining function. Example
[0034] Based on Example 1, as shown in the appendix Figure 2 As shown, when the roadbed is widened significantly (generally exceeding 3.0m), in this embodiment, one or two rows of micro-grouted steel pipe piles 5 are arranged at the end of the pile bearing plate 2 away from the support pile 1. The top of the micro-grouted steel pipe piles 5 is fixed to the pile bearing plate 2, and they are arranged along the embankment direction on the existing roadbed slope surface. The lower part is anchored into the deep strata through drilling and grouting, mainly playing a vertical bearing role. Through this measure, on the one hand, the bending moment within the pile bearing plate can be reduced, and on the other hand, an "h"-shaped reinforcement system can be formed with the support piles to better reinforce the roadbed slope.
[0035] Preferably, the micro-grouting steel pipe pile 5 is drilled using a small geological drilling rig, and the hole is filled with cement grout or cement mortar. The reinforcement material inside the pile has a cross-section of one of the following: circular, U-shaped, or "I" shaped.
[0036] In practice, micro-grouting steel pipe piles are arranged at 1.5m intervals, with a pile length of 12.0m and a borehole diameter of 200mm. Generally, the higher the slope, the higher the earthwork fill, and the worse the soil conditions in the anchorage section, the longer the pile should be; the specific length is determined mainly through calculation. Micro-grouting steel pipe piles are drilled using a small geological drilling rig, and cement grout or M30 cement mortar is injected into the hole using the bottom-grooving method. The reinforcement material inside the pile uses one of the following cross-sections: circular, U-shaped, or I-shaped. Example
[0037] Based on Example 1, as shown in the appendix Figure 3As shown, when the slope support height is high, or the soil strength in the anchorage section of the support pile is weak, this embodiment provides a row of prestressed anchor cables 6 along the direction of the support pile 1. This can better control the displacement of the support pile, shorten the length of the support pile anchorage section, reduce project costs, and improve the safety of the support structure.
[0038] Preferably, in this embodiment, the free section of the prestressed anchor cable is protected by a stainless steel sleeve 7 within the length of the cavity, while the remaining sections are protected by grouting.
[0039] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made using the content of this utility model specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.
Claims
1. A novel pile-slab combined retaining structure for widening steep slope embankments, characterized in that: This includes retaining piles, pile bearing plates, and pile retaining plates, among which: Several of the aforementioned support piles are installed at a predetermined interval at the toe of the existing embankment slope; The pile bearing plate is horizontally installed on the inner side of the upper middle part of the support pile. One end of the plate is fixed to the support pile to form a cantilever structure, and the other end extends into the slope of the existing embankment slope, so that the bottom of the pile bearing plate forms a cavity with the slope of the existing embankment slope. The retaining plate of the pile body is located on the inner side of the support pile and above the pile body bearing plate, and is used to block the filling soil.
2. The novel pile-slab combined retaining structure for widening steep slope embankments according to claim 1, characterized in that: The retaining plate of the pile body is anchored to the support pile through several pre-embedded anchor bars.
3. The novel pile-slab combined retaining structure for widening steep slope embankments according to claim 1, characterized in that: The cross-sectional shape of the anchoring section of the support pile is square or circular, and the cross-sectional shape of the cantilever section of the pile body is square.
4. The novel pile-slab combined retaining structure for widening steep slope embankments according to claim 1, characterized in that: It also includes micro-grouting steel pipe piles, at least one row of said micro-grouting steel pipe piles being anchored to the slope surface of the embankment, and the pile top being fixed to the end of the pile bearing plate away from the support pile.
5. The novel pile-slab combined retaining structure for widening steep slope embankments according to claim 4, characterized in that: The micro-grouting steel pipe piles are drilled using a small geological drilling rig, and the holes are filled with cement grout or cement mortar. The reinforcing material inside the pile has a cross-section of one of the following: circular, U-shaped, or "I" shaped.
6. The novel pile-slab combined retaining structure for widening steep slope embankments according to claim 1 or 4, characterized in that: It also includes prestressed anchor cables, with a row of prestressed anchor cables installed along the direction of the pile body.
7. The novel pile-slab combined retaining structure for widening steep slope embankments according to claim 6, characterized in that: The free section of the prestressed anchor cable is protected by a stainless steel sleeve within the length of the cavity, while the remaining sections are protected by grouting.